While driving near a nuclear plant in South Carolina, my wife and i spotted a wingless, oblong shaped aircraft.

We were driving on a road alongside Savhanna River Nuclear Plant, around 6-6:30 PM. I noticed overhead a low flying aircraft, the lights were on like aircraft, and I noticed that there were no wings and i turned to my wife and asked her "what is that?" It made NO noise and was almost as if it were "coasting" in the air. It wasn't moving fast, it wasn't moving slow. My wife screamed for me to get out of there...LEAVE! But, being curious of the site, I turned into a little side road and turned around, my wife was about frantic as I got out of the car, just wanting me to leave! It shift from a western heading to a northern heading. It didn't point that way, it just "slid" that way. I couldn't see it after it passed over the trees.